netdev - Re: [PATCH 0/5] We must use rcu_barrier() on module unload

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Message-ID: <4A2D197D.4060804@trash.net>
Date:	Mon, 08 Jun 2009 16:00:29 +0200
From:	Patrick McHardy <kaber@...sh.net>
To:	Jesper Dangaard Brouer <hawk@...x.dk>
CC:	"David S. Miller" <davem@...emloft.net>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	urs.thuermann@...kswagen.de, oliver.hartkopp@...kswagen.de,
	wg@...ndegger.com, vladislav.yasevich@...com, sri@...ibm.com,
	linux-sctp@...r.kernel.org, Trond.Myklebust@...app.com,
	linux-nfs@...r.kernel.org, netfilter-devel@...r.kernel.org
Subject: Re: [PATCH 0/5] We must use rcu_barrier() on module unload

Jesper Dangaard Brouer wrote:
> If an unloadable module uses RCU callbacks, it need to use
> rcu_barrier() so that the module may be safely unloaded.
> 
> While hacking on a netfilter module of my own, I learned the
> importance of calling rcu_barrier() instead of only a
> synchronize_rcu() on module unload (iif using any call_rcu()
> callbacks).  synchronize_rcu() does wait for a grace period to
> elapse, but it does not wait for the callbacks to complete.
> 
> ...
> I have made a patch for each individual module, so objections can be
> made on a per module basis.  I have Cc'ed all of the patches to the
> maintainers of each module (according to the MAINTAINERS file).

Acked-by: Patrick McHardy <kaber@...sh.net> for patches 1 and 2, good
catch.
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